This twin-rail setup features oversized internal passages

From there

BMW E88 135i

but the braket will hold any combination of standard body fuel pumps up to 39mm diameter

BMW M42 Fuel Rail SC7216 This twin-rail setup features oversizedThe Nuke Performance Fuel Rail for BMW M42 engines delivers modern fueling capability to your classic 4 cylinder setup. Designed for the M42B18 engine (19891996), this lightweight CNC machined aluminum rail supports high flow fuel delivery and is compatible with Bosch EV14 injectors and AN fuel lines. Built for performance and safety, the rail features Nukes patented Injector Safety Clips, which ensure a secure, leakproof sealeven in extreme pressure